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Libmpeg3 supports advanced editing and manipulation of MPEG streams.
MPEG is normally a last mile distribution format but with libmpeg3 you
can edit it like a production format. Unless you have a need for MPEG
editing and copying, you're better off using a consumer library like
FFMPEG.

Libmpeg3 is primarily a supporting library for Cinelerra. It supports all of the
nonstandard operations Cinelerra needs. Libmpeg3 provides a uniform
front end for a large number of the MPEG formats used in HDTV
broadcasting. It decodes

A table of contents feature allows it to seek with frame accuracy
regardless of whether the footage has timecode or not, or whether the
timecode is contiguous. Also included are utilities for stream
extraction, format querying, and copying.